Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f70f3ef53e82fd0…

MALICIOUS

PDF

53.6 KB Created: 2020-10-01 17:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 722f40929e9485d4e4aa1189ab042fa1 SHA-1: 2cbd3b982d42727e5ea476381a282a5e0ff3a983 SHA-256: 8f70f3ef53e82fd06e7e69134acb1a1c4f7647d595a97ad47d73092db0689914
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=accursed+share+pdf In PDF document text
    • http://files.finconitalia.com/uploads/1/3/1/6/131637147/998cd082bb6bf.pdfIn PDF document text
    • http://files.stackhousepark.com/uploads/1/3/0/7/130776409/2668435.pdfIn PDF document text
    • http://kudonete.annelisestenseth.com/uploads/1/3/1/3/131378985/fikaboxif-wizode-fadij.pdfIn PDF document text
    • http://nugisusaf.koinoniaatclarion.com/uploads/1/3/1/6/131636954/1919689.pdfIn PDF document text
    • https://site-1036811.mozfiles.com/files/1036811/mejilifigarafawinorefipur.pdfIn PDF document text
    • https://site-1038973.mozfiles.com/files/1038973/33358839081.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/72869066099.pdfIn PDF document text
    • https://site-1038810.mozfiles.com/files/1038810/sedobatez.pdfIn PDF document text
    • https://site-1036829.mozfiles.com/files/1036829/lupopoxuxasakarageru.pdfIn PDF document text
    • https://site-1037238.mozfiles.com/files/1037238/nizosutasode.pdfIn PDF document text
    • https://site-1036759.mozfiles.com/files/1036759/lenozizetazemapeluni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9094/2888/files/80153206597.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1043/6515/files/16810878921.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9207/4905/files/83900270670.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4350/3783/files/short_words_that_start_with_ri.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000946a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x946A 5200 bytes
SHA-256: 0faecedd388f25660a9d6b2a309f9bdbd00002818fc41f865cedc65fd1eb5488
font_01_sfnt_off0000a617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA617 10568 bytes
SHA-256: 07a3d2bded4beecc2a7599e54db9e5f1ed27d941dd7e804c60c47100c27c268d

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